62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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/*
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* Copyright (c) 2023 Carlo Caione, <ccaione@baylibre.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/mem_mgmt/mem_attr.h>
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#define _BUILD_MEM_ATTR_REGION(node_id) \
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{ \
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.dt_name = DT_NODE_FULL_NAME(node_id), \
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.dt_addr = DT_REG_ADDR(node_id), \
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.dt_size = DT_REG_SIZE(node_id), \
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.dt_attr = DT_PROP(node_id, zephyr_memory_attr), \
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},
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static const struct mem_attr_region_t mem_attr_region[] = {
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DT_MEMORY_ATTR_FOREACH_STATUS_OKAY_NODE(_BUILD_MEM_ATTR_REGION)
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};
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size_t mem_attr_get_regions(const struct mem_attr_region_t **region)
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{
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*region = mem_attr_region;
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return ARRAY_SIZE(mem_attr_region);
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}
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int mem_attr_check_buf(void *v_addr, size_t size, uint32_t attr)
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{
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uintptr_t addr = (uintptr_t) v_addr;
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/*
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* If MMU is enabled the address of the buffer is a virtual address
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* while the addresses in the DT are physical addresses. Given that we
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* have no way of knowing whether a mapping exists, we simply bail out.
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*/
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if (IS_ENABLED(CONFIG_MMU)) {
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return -ENOSYS;
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}
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if (size == 0) {
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return -ENOTSUP;
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}
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for (size_t idx = 0; idx < ARRAY_SIZE(mem_attr_region); idx++) {
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const struct mem_attr_region_t *region = &mem_attr_region[idx];
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size_t region_end = region->dt_addr + region->dt_size;
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/* Check if the buffer is in the region */
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if ((addr >= region->dt_addr) && (addr < region_end)) {
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/* Check if the buffer is entirely contained in the region */
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if ((addr + size) <= region_end) {
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/* check if the attribute is correct */
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return (region->dt_attr & attr) == attr ? 0 : -EINVAL;
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}
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return -ENOSPC;
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}
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}
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return -ENOBUFS;
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}
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